To understand evolution, we need to understand the age of the Earth.

So how old is the Earth? And how do we know?

Earth Science: Crash Course History of Science #20

How Do We Know How Old the Earth Is?

How We Know The Earth Is Ancient

World's Most Asked Questions: How Old is Earth?

A Brief History of Geologic Time

Four ways to understand the Earth's age

"Creation's Story - Evidence for an Ancient Earth"

The History of Geology

Is radiometric (or radioisotope) dating reliable? Yes. Radiometric Dating Does Work!